Site author Richard Steane	The BioTopics website gives access to interactive resource material, developed to support the learning and teaching of Biology at a variety of levels.
Introductory Topics FULL CONTENTS Classical topics Humans, Plants Variation, Ecology Further Topics Microbes Section Higher level topics A/AS level Section 3D molecules [Jsmol] MOLECULES MENU

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• Skin - generally dry - wounds healed after blood clots
• Nasal hairs - trap larger particles
• Cilia in the respiratory system act together with mucus to trap smaller particles e.g. bacteria and pass these into the digestive system for disposal by acids and enzymes.
• Lysozyme is an enzyme, found in many body fluids e.g. tears, that breaks down cell walls of many bacteria

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• Phagocytes (white blood cells) detect and engulf any thing "foreign" to the body, e.g. invading bacteria, and digest them
• The inflammatory response due to increased blood flow causes swelling and heat and increases contact with white blood cells

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